Move RefCountedMemory class to base namespace.

chrome/browser/ui/webui/downloads_ui.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_DOWNLOADS_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_DOWNLOADS_UI_H_
 #pragma once
 
 #include "content/public/browser/web_ui_controller.h"
 
+namespace base {
 class RefCountedMemory;
+}
 
 class DownloadsUI : public content::WebUIController {
  public:
   explicit DownloadsUI(content::WebUI* web_ui);
 
-  static RefCountedMemory* GetFaviconResourceBytes();
+  static base::RefCountedMemory* GetFaviconResourceBytes();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DownloadsUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_DOWNLOADS_UI_H_